Title: California fish and game
Identifier: californiafishga64_2cali (find matches)
Year: [1] (s)
Authors: California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game
Subjects: Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons
Publisher: (San Francisco, etc. ) State of California, Resources Agency, Dept. of Fish and Game
Contributing Library: California Department of Fish and Game
Digitizing Sponsor: Internet Archive

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112 CALIFORNIA FISH AND CAME
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FIGURE 3. Mean coefficients of community for the fish catches of the four study areas, and for the comparisons between the study areas (S.D. — standard deviation). In addition to comparing the specific composition of catches made in different parts of the bay, the coefficient of community analysis also can be used to compare catches made in the same location but at different times. A trellis diagram was constructed comparing the catches made in Area 3 in 1971 with those made in the same area in 1972 (Figure 4). It can be seen that the catches made in 1972 show somewhat less affinity with one another than do the catches of 1971. That is, the coefficients are less than 50 more often in 1972 than in 1971. Nevertheless, the coefficients are greater than 50 for the majority of the sample pairs within each study period, and for the majority of the sample pairs obtained from a comparison of the two study periods indicating that the catches for both periods are similar. This is supported by the observation that the mean coeffi- cients of community are high for each period (67.5 and 57.0) and for the comparison between study periods (57.8) (Figure 5). It is clear that no major changes in the specific composition of fish catches occurred between 1971 and 1972 in Area 3.

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